DC348A Datasheet DC348A | P1-P3

DC348A Introduction

Description

Demonstration circuit DC348 demonstrates the low power LTC1878 monolithic

synchronous regulator in a power supply optimized for cellular phone applications. The

LTC1878 is ideal for this application because of its 550kHz switching frequency, low

quiescent current (power) consumption, and small package size (MSOP). The DC supply

current is typically 10µA at no load and less than 1µA in shutdown. The high switching

frequency allows the use of tiny surface mount components. With an input voltage range

of 2.65V to 6V, the LTC1878 is ideally suited for Lithium-Ion Battery applications.

Quick Start Guide

It is easy to set up DC348 to evaluate the performance of the LTC1878. Please follow the

procedure outlined below for proper operation.

1. Connect the input power supply to the V

and GND terminals. Refer to Figure 1 for

proper measurement equipment setup.

2. Connect the load between the V

OUT

and GND terminals.

3. To shut down the circuit, connect the RUN/SS pin to ground.

4. For synchronized operation, connect the clock signal between the SYNC and GND

terminals

–

LOAD

RUN

VIN

GND

SYNC

VOUT

GND

LTC1878EMS8

High Efficiency Monolithic Synchronous

Step-Down Regulator

Demo Circuit DC348A

Figure 1. DC348A Hook-up Diagram

4 4

3 3

2 2

1 1

2.7V - 5V

1.8V @

200 mA

(max)

Vout(V)

Rfb1(ohms)

1.5

2.5

3.3

412K

280K

VIN

RUN

SYNC

VOUT

GND

Cin

Cout

Cffw

Rfb2

Rfb1

Cith

PCB SILKSCREEN

DEMO DC348A LTC1878EMS8

High Efficiency Monolithic Synchronous Step-Down Regulator

LINEAR TECHNOLOGY CORPORATION

1630 McCarthy Blvd.

Milpitas, CA 95035

(408) 432-1900

(408) 434-0507 FAX

Wednesday, January 31, 2001

Title

Size Document Number Rev

Date: Sheet of

LTC1878

4 5

Ith

RUN

Vfb

GND SW

Vin

SYNC

PLL LPF

100K

Rfar1

100K

Rfar2

Cout

22uF

6.3V

Optional

Cin

4.7 uF, 6.3V

715k, 1%

Rfb1

4.7 uH

887k, 1%

Rfb2

Cffw

22 pF

Cith

220 pF

Linear Technology Corporation

LTC1878

Bill Of Material

Demo Bd. #348A

6/16/2005

12:54 PM

Item Qty Referenc

Part Description Manufacture Part#

1 1 Cffw CAP., NPO 22pF 25V, 0402 AVX, 04023A220JAT1A

2 1 Cin CAP., X5R 4.7uF, 6.3V, 0805 TAIYO YUDEN, JMK212BJ475MG

3 1 Cith CAP., X7R 220pF, 16V, 0402 AVX, 0402YC221KAT1A

4 1 Cout CAP., X5R 22uF, 6.3V 1210 MURATA, GRM42-2X5R226K6.3

5 1 Cc Optional

6 1 L1 INDUCTOR, SMD 4.7 uH TAIYO YUDEN, LB2016T4R7K

7 2 Rfar1,Rfar2 RES.,CHIP 100K, 1/16W 5% 0603 AAC, CR16-104JM

8 1 Rfb1 RES.,CHIP 715K, 1/16W 1% 0402 AAC, CR05-7153FM

9 1 Rfb2 RES.,CHIP 887K, 1/6W 1% 0402 AAC, CR05-8873FM

10 1 Rc Optional

11 6 E1,E2,E3,E4,E5,E6 TURRET MILL-MAX, 2501-2

12 1 U1 I.C., LTC1878EMS8 LINEAR, LTC1878EMS8

PAGE 1 OF 1

P1-P3

DC348A

Mfr. #:

Buy DC348A

Manufacturer:

Analog Devices Inc.

Description:

Power Management IC Development Tools LTC1878EMS8 - High Efficiency Monolithic

Lifecycle:

New from this manufacturer.

Delivery:

DHL FedEx Ups TNT EMS

Payment:

T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet

DC348A